Automotive additives and sealants containing waste powder prime

ABSTRACT

The present invention is directed to compositions for use as additives in the automotive industry, which compositions contain waste powder prime and a plasticizer selected from the group consisting of 2-ethylhexyl diphenyl phosphate, diisoheptyl phthalate, a linear phthalate based upon C 7 -C 9  alcohols, a mixture of esters containing a minimum of 55 percent of diesters and a maximum of 20 percent dibenzoate, a mixture of esters containing a minimum of 60 percent of diesters and a maximum of 30 percent dibenzoate and dipropylene glycol dibenzoate and automotive sealants which contain waste powder prime, a plasticizer selected from the group consisting of 2-ethylhexyl diphenyl phosphate, diisoheptyl phthalate, a linear phthalate based upon C 7 -C 9  alcohols, a mixture of esters containing a minimum of 55 percent of diesters and a maximum of 20 percent dibenzoate, a mixture of esters containing a minimum of 60 percent of diesters and a maximum of 30 percent dibenzoate and dipropylene glycol dibenzoate and automotive sealants; and a polymeric resin.

FIELD OF THE INVENTION

The invention relates to compositions which may be used in theautomotive industry, particularly as additives in the preparation ofautomotive sealants.

BACKGROUND OF THE INVENTION

In the manufacture of automobiles, the bodies and frame assembliesthereof are coated, or primed, electrostatically with a 100 percentsolids powder spray. The compositions of such powder sprays, referred toin the automotive industry as “powder prime”, and methods ofelectrostatically applying the powder prime are well known to thoseskilled in the automotive industry. It is estimated that on the order of25,000 pounds per month of 100 percent solids waste powder prime may begenerated at each assembly plant in which it is used to prime autoparts, such as frame assemblies. The waste powder prime, that primewhich does not remain affixed to the primed auto part and which isrecovered subsequent to the electrostatic deposition of the powder primethereon, currently is being transported to landfills for disposal. Itwould be considered to be a significant environmental advance andcontribution if one were to discover a use of waste powder prime, suchthat the present practice of disposing of waste powder prime inlandfills could be reduced significantly, or totally eliminated.

Also in the manufacture of automobiles, automotive sealants are used inorder to prevent air, water and dust intrusion into the passengercompartment of the automobile. These sealants typically are made ofplastisols, those being mixtures of plasticizers and polymeric resinssuch as poly(vinyl chloride), poly(vinyl acetate), or copolymers ofvinyl chloride and vinyl acetate. Other polymers may be used as well inpreparation of the plastisols. The sealants further may containingredients such as fillers, for instance calcium carbonate, talc,calcium oxide, and glass hollowspheres; rheological additives such asthixotropes, for instance silicas and clay derivatives, and pigments,for instance titanium dioxide and carbon black. Because the adhesion ofa plastisol to cold-rolled-steel or electrodeposition coatings (E-coat)is poor, conventional sealants must contain adhesion promoters. The mostcommon of the adhesion promoters used in preparation of the sealants ispolyamidoamines. Without the adhesion promoters, such sealants willexhibit poor adhesion to such substrates as cold rolled steel and theE-coat.

It has been reported that waste paint sludge which is recovered fromautomotive “painting” processes and which contains water, solvent anduncured polymer, may be used in the preparation of automotive sealants.However, before the waste paint sludge may be used to prepare automotivesealants, the waste paint sludge must undergo extensive treatment andprocessing to remove all or most of the water or solvent from the wastesludge. The “painting” operations from which the waste sludge isrecovered differ from the “electrostatic deposition” from which thewaste powder prime is recovered. The powder prime never contains wateror solvent, either as a virgin material or as a waste material.Additionally, the powder prime does not utilize ingredients such astackifiers, plasticizers and coalescents, which commonly are used infilm-forming “paints” formulated with water and/or solvents.

The present inventors surprisingly have discovered that waste powderprime may be used, without further recycling or treatment, in order toformulate compositions which may be used in the automotive industry.Specifically, the inventors surprisingly have discovered that wastepowder prime may be used in combination with specific plasticizers inorder to prepare compositions which may be used as additives in theautomotive industry. In particular, the additives are used in thepreparation of automotive sealants.

The inventors can identify at least three distinct advantages of theirinvention over the prior art paint sludge. First, the waste powder primerequires no processing to remove unwanted solvent or water prior to itsuse in the preparation of automotive sealants. Second, the waste powderprime typically is free or essentially free of components such astackifiers, plasticizers and coalescents, which commonly are used infilm-forming “paints” formulated with water and/or solvents. As aresult, in the formulation of compositions which utilize waste powderprime, the formulator need not be concerned with detrimental affectssuch components might have on the particular formulated compositions.Finally, the present invention provides a practical and economicalsolution to a significant environmental need by reducing or eliminatingthe amount of waste powder prime which is disposed of in landfills,without the need for extensive and expensive recycling processes, whileunexpectedly providing improvements in automotive compositions whichhave not been reported heretofore. It is believed that each of the aboveadvantages in and of itself constitutes a significant improvement overthe prior art “paint sludge” containing water and solvent, as discussedabove. In addition to the fact that all three of the above advantagesmay be realized simultaneously, the compositions of the presentinvention offer other advantages which are disclosed herein below.

SUMMARY OF THE INVENTION

The present invention is directed to compositions which may be used asadditives in the automotive industry, which compositions comprise wastepowder prime (WPP) and a plasticizer selected from the group consistingof 2-ethylhexyl diphenyl phosphate, diisoheptyl phthalate, a linearphthalate based upon C₇-C₉ alcohols, a mixture of esters, anddipropylene glycol dibenzoate. When used as an additive, in thepreparation of formulated automotive sealants which are substantiallyfree of an adhesion promoter, or preferably which are free of anadhesion promoter, the inventive additives provide sealants whichexhibit adhesion which is as good as or better than conventionalautomotive sealants which do contain an adhesion promoter inconventional amounts used to provide adhesion to automotive sealants.Also included within the scope of the present invention are automotivesealant compositions which comprise a polymeric resin, WPP and aplasticizer selected from the group consisting of 2-ethylhexyl diphenylphosphate, diisoheptyl phthalate, a linear phthalate based upon C₇-C₉alcohols, a mixture of esters, and dipropylene glycol dibenzoate.

DETAILED DESCRIPTION OF THE INVENTION PREFERRED EMBODIMENTS

The compositions of the present invention which may be used as additivesin the automotive industry comprise a dispersion of WPP in a plasticizerselected from the group consisting of 2-ethylhexyl diphenyl phosphate,diisoheptyl phthalate, a linear phthalate based upon C₇-C₉ alcohols, amixture of esters, and dipropylene glycol dibenzoate, at a weight ratioof WPP: plasticizer of 1:10 to 10:1. Unless specifically statedotherwise, all percentages of components referred to herein are weightpercent based on the total weight of the composition containing suchcomponents. The exact ratio of WPP: plasticizer will be determined byvarious factors. For instance, the desired viscosity of the compositionwhich utilizes the inventive additives will be a factor. The particularsubstrate to which the composition is applied is another factor to beconsidered in choosing the appropriate ratio of WPP to plasticizer. Forinstance, adhesion and film-forming properties of the compositions willdiffer when applied to a cold-rolled-steel substrate, for example,versus a surface which has been primed or E-coated with a spray prime orpowder prime. One skilled in the art, once having the benefit of thisdisclosure, would be able to ascertain readily the desired weight ratioof WPP: plasticizer, based on such considerations.

Compositions of WPP are well known to those skilled in the automotiveindustry and are dependent upon the specific powder prime which was usedto electrostatically coat the parts of the automobile. Typically, WPPwill contain a polymeric resin, such as a polyester, a polyester/acryliccopolymer or a polyester/acrylic/polyurethane terpolymer. The WPP may beused directly in preparing the additive compositions, i.e. without theneed for further treatment or processing of the WPP after it has beenrecovered from the electrostatic powder priming process. The compositionof a typical WPP is set forth in Table 1. As one skilled in theautomotive industry would know, the exact composition of WPP will dependon the particular powder prime formulation used to electrostaticallycoat the auto bodies and frame assemblies. As such, the composition ofTable 1 should not be construed as the only WPP which finds utility inthe present invention. Rather, the waste powder prime generated from anyof the conventional electrostatic deposition processes which utilizeconventional powder primes could be used in the present invention.

TABLE 1 Powder Prime CAS Number Ingredient Weight Percent 13463-67-7Titanium Dioxide  5-10 1333-86-4 Carbon Black 0-1 7727-43-7 BariumSulfate 0-5 None Acid Functional Polyester Resin 0-5 None AcrylicPolymer 0-2 693-23-2 1,12 Dodecanedioic Acid 10-20 119-53-9 BenzoylCarbinol 0-2 None GlydicylGlycidyl Acrylic Polymer 60-80 None BisphenolA Digliycidyl Diglycidyl 0-3 Ether Polymer 7631-86-9 Silica 0-1

The plasticizers used in preparing the additive compositions must havecertain properties when combined with the WPP. When formulated intocompositions which are used in the automotive industry, for exampleautomotive sealants, the additives must provide compositions which arestable to excessive viscosity changes over time, i.e., the compositionsare viscosity-stable. In order for the compositions to beviscosity-stable, the additive comprising the WPP and the plasticizeralso must be viscosity-stable. Preferably, a dispersion of the WPP inthe plasticizer, at a 1:1 weight ratio, will exhibit a change inviscosity of less than 190 percent, preferably less than 150 percent,and even more preferably less than 100 percent, after 72 hours at atemperature of 25° C. The plasticizer also must be nonvolatile to theextent it does not volatilize at temperatures commonly used in thoseprocesses utilized within the automotive industry which might employ theadditives of the present invention. In addition to be being stable toexcessive viscosity change, the plasticizer must provide dispersionswhich do not gel, solidify, precipitate, or otherwise undergo physicalchanges which would render the dispersions unsatisfactory for theirintended use.

Plasticizers which were found to provide a WPP/plasticizer dispersionhaving excellent stability, are 2-ethylhexyl diphenyl phosphate(available from Monsanto under the trade name Santicizer 141, CAS#1241-94-7), having a change of 24 percent and diisoheptyl phthalate(available from Exxon Chemical under the trade name Jayflex 77, CAS#71888-89-6), having a change of 38 percent. Accordingly, the preferredplasticizers used in preparing the additive compositions are selectedfrom the group consisting of 2-ethylhexyl diphenyl phosphate anddiisoheptyl phthalate.

Plasticizers which were found to provide good to fair stability includea linear phthalate based upon C₇-C₉ alcohols (available from BASF underthe trade name Palatinol 79P, a mixture of CAS #s 68515-45-7, 68515-44-6and 111381-89-6), having a change of 114 percent; a mixture of esterscontaining from about 50 to about 85 percent of2-methyl-3-(benzoyloxy)-2,2,4-trimethylpentyl ester propanoic acid,- 2-methyl- 3 -(benzoyloxy)- 2,2,4 -trimethylpentyl ester (CAS#22527-63-5), from about 10 to 30 percent of2,2,3-trimethyl-1,3-pentanediol dibenzoate 2,2,4-trimethyl- 1,3-pentanediol benzoate (CAS #68052-23-3) and from about 5 to about 10percent of 2-methyl-2,2-dimethyl-1-(1-methylethyl)-1,3-propanediyl esterpropanoic acid,- 2 -methyl- 2,2 -dimethyl- 1 -( 1 -methylethyl)- 1,3-propanediyl ester (CAS #6846-50-0) (available from Huls America underthe trade names Nuoplaz 6000 and Nuoplaz 1046). The Nuoplaz 6000 wastested and found to exhibit a change of 137 percent. Another plasticizerexhibiting fair viscosity stability is dipropylene glycol dibenzoate(available from Kalama Chemical under the trade name K-Flex DP, CAS#27138-31-4), having a change of 186 percent.

Plasticizers which were found to provide WPP/plasticizer dispersionshaving poor stability, eg. greater than 200 percent viscosity change,include chlorinated C₁₄-C₇ alkanes, (too thick to test) (available fromICI Forest Products under the trade name Cereclor S45, CAS #85535-85-9);polyester adipate (too thick to test) (available from C.P. Hall underthe trade name Plasthall P-760, Cas #103-21-1); and Texanol benzylphthalate (too thick to test) (available from Monsanto under the tradename Santicizer 278, CAS #16883-83-3). Other such plasticizers includediisononyl phthalate (268 percent change) (Jayflex DINP, CAS#68515-48-0); diisodecyl phthalate (206 percent change) (Jayflex DINA,CAS #33703-08-1); Di-L-Nonyl phthalate (238 percent change) (JayflexL9P, CAS # unknown); and Di-(2-ethylhexyl) Adipate (286 percent change)(Jayflex DOA, CAS #103-23-1), all of which are available from ExxonChemical under the respective Jayflex trade name. Additionalplasticizers providing poor stability include a petroleum distillate(Viplex 885, CAS #68477-29-2) and a heavy paraffinic distillate solventextract (Viplex 530-A), both of which are available from CrowleyChemical under the respective Viplex trade name and both of which weretoo thick to test. In addition to the excessive viscosity change over 72hours at 25° C., many of the “poor” plasticizers exhibited gelling,solidification or physical changes over time, which would make thecombinations of those plasticizers and WPP unacceptable for compositionsaccording to the present invention.

When used in automotive sealants, in addition to being stable, theadditives must provide the sealants with shear strength and tensilestrength which are sufficient for the sealants sealants' intended use.In addition to the WPP and selected plasticizer, automotive sealantsaccording to the present invention also will contain a polymeric resinof the type used to prepare conventional automotive sealants. Thepolymeric resin basically is used in the sealant as a film-former.Accordingly, the polymeric resin will be present in the sealant inamounts effective to provide the automotive sealant with film-formingproperties which are sufficient for the particular end-use of thesealant. Once having the benefit of this disclosure, one skilled in theart of automotive sealants will be able to ascertain readily the exactamount of the polymeric resin required to provide the particularfilm-forming properties for the particular end-use. Exemplary polymericresins include poly(vinyl chloride) (PVC), poly (vinyl acetate) (PVAc),or copolymers of vinyl chloride and copolymers of vinyl acetate. Otherpolymers conventionally used to prepare conventional automotive sealantsmay be used as well. Preferably, the polymeric resin is PVC.

The automotive sealant will contain from about 10 to about 50 percent ofthe polymeric resin, preferably from about 15 to about 40 percent of thepolymeric resin, and more preferably from about 20 to about 25 percent.The automotive sealant will contain from about 0.1 to about 50 percentof the WPP, preferably from about 5 to about 40 percent of the WPP, andmore preferably from about 10 to about 30 percent of the WPP. Theautomotive sealant will contain from about 0.1 to about 50 percent ofthe plasticizer, preferably from about 5 to about 40 percent of theplasticizer, and more preferably from about 25 to about 30 percent ofthe plasticizer.

Automotive sealants according to the present invention do not requireadhesion promoters in order to bond to primed surfaces and E-coat. Insome cases, adhesion of automotive sealants which contain the inventiveadditive containing WPP and plasticizer, yet which do not contain anadhesion promoter of the type used to prepare conventional automotivesealants in effective amounts used to prepare conventional automotivesealants, is greater than or equal to that of a conventional sealantwhich contains an adhesion promoter. While the automotive sealants ofthe present invention may contain small amounts of an adhesion promoterof the type used to prepare conventional automotive sealants in order toimprove adhesion to cold-rolled-steel substrates, the automotivesealants of the present invention preferably are substantially free ofan adhesion promoter of the type used to prepare conventional automotivesealants, and even more preferably the sealants are free of suchadhesion promoters. By substantially free of an adhesion promoter, it ismeant that the automotive sealants do not contain an adhesion promoterin such concentrations as are conventionally used in preparingconventional automotive sealants which contain adhesion promoters andwhich do not contain WPP, or concentrations which would materiallyaffect or alter the characteristics or properties of the automotivesealant according to the present invention.

When used, the adhesion promotion system used in the sealant formulationpreferably contains an unsaturated organosilane; an acrylic monomer; andan unsaturated acid or anhydride monomer. Most preferably it alsocontains an epoxy resin or modified epoxy resin and a hardening agentfor the epoxy resin, such as a polyamide or modified polyamide. Examplesof unsaturated organosilanes are vinyl trichlorosilane, vinyl triethoxysilane, vinyl trimethoxy silane, vinyl-tris B-methoxy-ethoxy silane, and3-methacryloxypropyl trimethoxy silane. Examples of acrylic monomers aretrimethylolpropane trimethacrylate, hexane diol diacrylate, and butylmethacrylate. Examples of unsaturated acid or anhydride monomers are ismaleic, acrylic, crotonic, methacrylic, oleic, linoleic, andtetrahydrophthalic acid or anhydride.

Examples of unmodified epoxy resins are those based on bisphenol-A andepichlorohydrin with typical properties that includes an epoxy value of152 to 155 equiv/100 g and a weight per epoxide of 182 to 192. Othertypical epoxy resins are phenol novolac, triphenylolmethane andtetrabromo bis-A. An example of a modified epoxy resin includes thepreferred elastomeric modified liquid epoxy resin which is a 40% adductof carboxylated acrylonitrile butadiene elastomer and a liquidbis-phenol-A and epichlorohydrin type epoxy. That adduct has a weightper epoxide of 325 to 375. Curing for the epoxy or modified epoxy resinis accomplished by reacting the resin with an appropriate curing orhardening agent. Typical hardening agents are polyamides,diethylenetriamine, methane diamine, m-phenylene diamine, phenol,dicyandiamide, BF₃-monoethyl amine and nadicmethyl anhydride. Preferredis a modified polyamide hardening agent such as a latent polyamidedispersion which is an adduct of phthalic anhydride anddiethylenetriamine in an unmodified liquid epoxy resin. The most commonof the adhesion promoters used in preparation of conventional automotivesealants are polyamidoamines. When used, the adhesion promoters willcomprise from about 0.5 to about 5 percent of the sealant.

The sealants further may contain components such as fillers, forinstance calcium carbonate, talc, calcium oxide, and glasshollowspheres; rheological modifiers such as thixotropes, for instancesilicas and clay derivatives; solvents such as odorless mineral spirits;and pigments, for instance titanium dioxide and carbon black. Eachcomponent is used in amounts effective to perform the specific functionfor which the component is used. Filler concentrations used in theautomotive sealants may vary from about 5 to about 60 percent.Rheological modifier concentrations used in the automotive sealants mayvary from about 1 to about 10 percent. Solvent concentrations used inthe automotive sealants may vary from 0 to about 5 percent. Pigmentconcentrations used in the automotive sealants may vary from 0 to about5 percent. It should be noted that, while the sealants will containpigment which has been incorporated via the WPP, additional pigment maybe added when formulating a particular automotive sealant, although itis not required.

In preparing the automotive sealants of the present invention, a stabledispersion of the waste powder prime in the plasticizer is prepared byadmixing the plasticizer and the WPP in a mixer, such as a Cowles mixer,at ambient temperatures and at blade speeds which are effective to formthe stable dispersion. The dispersion then is admixed in a mixer, suchas a Cowles mixer, at ambient conditions with the polymeric resin and,where desired, other optional components as described above. The mixingprocedures are very basic and are well known to those skilled in the artof preparing automotive sealants.

The following examples are set forth to exemplify certain embodiments ofthe present invention and should not be construed to limit the scope ofthe invention in any way. The scope of the invention is limited only bythe claims appended hereto.

An automotive sealant according to the present invention was preparedand is identified as Sealant 2 in Table 2. A comparative automotivesealant also was prepared and is identified as Sealant 1 in Table 2.

TABLE 2 Component Sealant 1 Sealant 2 2-ethylhexyl diphenyl 30.30 28.28phosphate PVC Resin 28.47 23.03 Filler 37.47 31.11 Solvent 0.40 2.02Thixotrope 1.55 0.40 Adhesion Promoter 0.49 0.00 Pigment 1.32 0.00 WPPof Table 1 0.00 15.15 TOTAL 100.00 99.99

Sealants 1 and 2 were evaluated according to the following testprotocol. Results of the evaluation are set forth in Table 3.

TEST PROTOCOL

Viscosity-stability:

The viscosity-stability of the dispersion of the WPP in plasticizer wasdetermined as follows. The viscosity of the dispersion was measured witha Brookfield RVT viscometer, at 20 rpm, with the spindle selection beingdependent upon the viscosity range of the dispersion to be measured. Thedispersion then is allowed to stand for 72 hours at 25° C. The viscosityof the standing dispersion then is measured again and the percentviscosity change calculated.

Physical properties:

The following standard ASTM methods were conducted in order to generatethe data contained in Table 3. All methods are standard methods used inthe automotive field to characterize the respective physical propertiesof automotive sealants.

Shear strength:

ASTM D1002-94, modified such that the bond line in the test procedure is0.03 inch with a 1 inch overlap, versus the standard ASTM procedurehaving a bond line of 0.001 inch and a 0.5 inch overlap. The exact bondline and overlap selected may depend on factors such as sealantformulation, substrate and customer specifications.

Tensile strength: ASTM D638-94b, unmodified

Elongation: ASTM D638-94b, unmodified

TABLE 3 Property Sealant 1 Sealant 2 Density 1.40 1.40 Solid Content 96%98% Viscosity (.104″, 40 psi) 18-22 seconds 10-15 seconds Sag Resistance2 mm 2 mm Pressure Stability No caking or No caking or 3000 psi/24 hrsseparation separation Shear Strength 315.0 psi 330.0 psi TensileStrength 310.0 psi 315.0 psi Elongation 240% 240% Reflow CharacteristicNo visible grooves no visible grooves

As the data indicate, Sealant 2 surprisingly exhibits properties ofstrength and elongation which are as good as, if not better than, thecomparative automotive sealant which contains an adhesion promoter.Additionally, other properties of Sealant 2, for example, elevatedstability and paintability, are equivalent to comparative Sealant 1. Asa result of using WPP in formulating the automotive sealant, theadhesion promoter may be removed altogether and the concentrations ofboth the polymeric resin and the filler may be reduced significantly andreplaced with WPP. Accordingly, not only is the inventionenvironmentally advantageous and as good as or better than conventionalsealants with respect to adhesion and the like, but the presentinvention may provide a significant cost reduction in the automotivesealants formulated therewith, in that virgin raw materials, such as theresin, filler and adhesion promotor, may be replaced with WPP.

What is claimed is:
 1. A composition, comprising: waste powder prime;and a plasticizer selected from the group consisting of 2-ethylhexyldiphenyl phosphate, diisoheptyl phthalate, a linear phthalate based uponC₇-C₉ alcohols, a mixture of esters containing from about 50 to about 85percent of 2-methyl-3-(benzoyloxy)-2,2,4-trimethylpentyl ester propanoicacid,- 2 -methyl- 3 -(benzoyloxy)- 2,2,4 -trimethylpentyl ester (CAS#22527-63-5), from about 10 to 30 1 percent of2,2,3-trimethyl-1,3-pentanediol dibenzoate 2,2,4-trimethyl- 1,3-pentanediol dibenzoate (CAS #68052-23-3) and from about 5 to about 10percent of 2-methyl-2,2-dimethyl-1-(1-methylethyl)-1,3-propanediyl esterand propanoic acid,- 2 -methyl- 2,2 -dimethyl- 1 -( 1 -methylethyl)- 1,3-propanediyl ester (CAS #6846 - 50 - 0 ) dipropylene glycol dibenzoateand mixtures thereof, wherein the waste powder prime and the plasticizerare present in amounts effective to provide a viscosity-stabledispersion of the waste powder prime in the plasticizer.
 2. Thecomposition of claim 1 wherein the waste powder prime and theplasticizer are present at a weight ration ratio of about 1:10 to about10:1.
 3. The composition of claim 1 wherein the plasticizer is selectedfrom the group consisting of 2-ethylhexyl diphenyl phosphate,diisoheptyl phthalate, a linear phthalate based upon C₇-C₉ alcohols, anddipropylene glycol dibenzoate.
 4. The composition of claim 1 wherein theplasticizer is selected from the group consisting of 2-ethylhexyldiphenyl phosphate and diisoheptyl phthalate.
 5. The composition ofclaim 1 further comprising a polymeric resin of the type used to prepareconventional automotive sealants, in amounts effective to providefilm-forming properties to the automotive sealant.
 6. The composition ofclaim 5 comprising from about 0.1 to about 50 percent of the wastepowder prime, from about 0.1 to about 50 percent of the plasticizer andfrom about 10 to about 50 percent of the polymeric resin.
 7. Thecomposition of claim 6 wherein the polymeric resin is selected from thegroup consisting of poly(vinyl chloride), poly(vinyl acetate),copolymers of vinyl chloride and copolymers of vinyl acetate.
 8. Thecomposition of claim 1 further comprising a component selected from thegroup consisting of an adhesion promoter, a filler, a solvent and arheology modifier, in amounts effective to perform the specific functionfor which the component is used.
 9. The composition of claim 1 whereinsaid composition is free of adhesion promoters.
 10. A compositioncomprising waste powder prime and a plasticizer, wherein the plasticizeris selected and is present in an amount relative to the waste powderprime effective to provide a viscosity-stable dispersion of the wastepowder prime in the plasticizer, wherein the plasticizer is selectedfrom the group consisting of mixed isobutyrates, benzoate esters oftrimethylpentanediols, and mixtures thereof.
 11. The composition ofclaim 10 wherein the waste powder prime and the plasticizer are presentat a weight ratio of about 1:10 to about 10:1.
 12. The composition ofclaim 11 further comprising a polymeric resin used to prepare anautomotive sealant in an amount effective to provide film-formingproperties to the automotive sealant.
 13. The composition of claim 12comprising from about 0.1 to about 50 percent of the waste powder prime,from about 0.1 to about 50 percent of the plasticizer and from about 10to about 50 percent of the polymeric resin.
 14. The composition of claim12 wherein the polymeric resin is selected from the group consisting ofpoly (vinyl chloride), poly (vinyl acetate), copolymers of vinylchloride and copolymers of vinyl acetate.
 15. The composition of claim12 further comprising an effective amount of a component selected from agroup consisting of an adhesion promoter, a filler, a solvent and arheology modifier.
 16. The composition of claim 10 wherein saidcomposition is free of adhesion promoters.
 17. The composition of claim10 wherein said plasticizer comprises a mixture of esters containingpropanoic acid- 2 -methyl- 3 -(benzoyloxy)- 2,2,4 -trimethylpentylester, 2,2,4 -trimethyl- 1,3 -pentanediol dibenzoate and propanoic acid-2 -methyl- 2,2 -dimethyl- 1 -( 1 -methylethyl)- 1,3 -propanediyl ester.18. A composition comprising waste powder prime and a plasticizer,wherein the plasticizer is selected and is present in an amount relativeto the waste powder prime effective to provide a viscosity-stabledispersion of the waste powder prime in the plasticizer, wherein saidplasticizer is selected from the group consisting of 2 -ethylhexyldiphenyl phosphate, diisoheptyl phthalate, a linear phthalate based uponC ₇ -C ₉ alcohols, and dipropylene glycol dibenzoate.